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PEC > PEC 6 > Flashcards

PEC 6 Flashcards

1
Q

For non-dwelling receptacle loads, the demand factor for the first 10 kVA or less shall be ___%.

A

100%

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2
Q

In each conduit run entering an enclosure for switches, circuit breakers, relays and others that may produce high temperatures, seals on the conduit shall be installed within _______`(mm) length before entering the enclosure.

A

460 mm

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3
Q

The ampacity of the conductors can be derated at most, _ times.

A

3

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4
Q

In the schedule of loads for lighting, which of the following contents is NOT necessary?

Protective device rating
Panel as numbered in the feeder diagram
Number of lighting outlets per circuit
Frequency rating

A

Frequency rating

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5
Q

If potential exceeding ___V are employed, a permanent warning sign shall be displayed.

A

600 V

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6
Q

is a load where maximum current is expected to continue for 3 hours or more. (April 2016)

A

Continuous load

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7
Q

Communication conductors shall NOT be smaller than (mm2)

A

2 mm2.

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8
Q

Receptacle and attachment plugs shall be permitted to be of lower ampere rating than the branch circuit but NOT less than ___% of the fixture full load current

A

125%

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9
Q

A wye-delta starter for a single voltage three phase squirrel cage induction motor would require the connection of _____ from the motor.

A

6 wires

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10
Q

At least (_) receptacle outlet shall be installed outdoors for a one family dwelling unit.

A

1

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11
Q

is the maximum permitted load of a 15 A branch circuit. (A)

A

12 A

Note: Load permitted shall NOT exceed 80% of the branch circuit rating

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12
Q

Where a feeder supplies continuous load or any combination of continuous and non-continuous load. The rating of the over-current device shall NOT be less than the non-continuous load plus ____% of the continuous load.

A

125%

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13
Q

Faceplates of insulating material shall be non-combustible and NOT less than _____(mm) in thickness.

A

2.3 mm

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14
Q

For raceway ____(mm) trade size or larger containing conductors _____(mm2) or larger, the minimum length of the box in straight pulls shall NOT be less than _____ the trade diameter of the largest raceway.

A

20 mm
22 mm2
8 times

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15
Q

Type MC cable shall NOT be used (3)

A

Where exposed to corrosive materials
As direct burial to earth
Where exposed to cinder fills

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16
Q

Using aluminum or copper clad aluminum conductors, the minimum size of service entrance conductors shall be ______(mm2).

A

14 mm2

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17
Q

Ground counterpoise conductor shall be soft copper wire NOT smaller than ____(mm2)

A

8 mm2.

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18
Q

The disconnecting means for motor circuits rated up to ______V, shall have an ampere rating of at least ___% of the full load current of the motor.

A

600 volts

115%

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19
Q

How many amperes will a 100 A circuit breaker hold before tripping open the circuit? (use rule of thumb).

A

Ans. 300 A

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20
Q

is a device for transferring one or more load conductor connections from one power source to another.

A

Transfer switch

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21
Q

. For an AC transformer and DC rectifier arc welder having a time rating of one hour, the supply conductors shall NOT be less than ____% of its rated primary nameplate current.

A

75%

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22
Q

refers to the power plant mounted on wheels as used in the railroad transportation industry.

A

Electric locomotive

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23
Q

If the terminal of the equipment grounding conductor is not visible, the conductor entrance hole shall be marked with the word “_______”.

A

green

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24
Q

Type NMC (non-metallic sheathed cable) shall have an outer covering which has the following characteristics. Which one is NOT included?

Flame retardant
Moisture resistant
Corrosion resistant
None of these

A

None of these

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25
Q

________ maybe used where installed in industrial establishment where a registered master electrician will service the installation.

A

Power and control tray cables (type TC)

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26
Q

Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of _______(mm) horizontally shall be provided.

A

800 mm

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27
Q

A one family dwelling unit shall have a disconnecting means of at least ___A where the initial computed load is 10 kVA or more.

A

60 A

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28
Q

Large batteries are those connected to a charging device with an output of more than ___kw

A

2 kW

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29
Q

is a component of a DC motor which is used to control the speed.

A

Field winding

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30
Q

Switches used in watercrafts, shall be capable of breaking and making safely a load current equal to ____% of their rated current at the rated voltage.

A

150%

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31
Q

is a wiring method using knobs, tubes, and flexible non-metallic tubing for the protection and support of single insulated conductors concealed in hollow spaces of walls and ceilings of buildings.

A

Concealed knob and tube wiring

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32
Q

The ampacity of the branch circuit conductors and the rating or setting of over-current protective devices supplying fixed electric space heating equipment consisting of resistance elements with or without a motor shall NOT be less than ___% of the total load of the motors and the heaters

A

125%

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33
Q

Both _____(2) is a repulsion motor equipped.

A

commutator and slip ring

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34
Q

Communication conductors shall have a vertical clearance of NOT less than _____(mm) from all points of roofs above, which they pass.

A

2,400 mm

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35
Q

______ is a luminous discharge due to ionization of the air surrounding a conductor caused by a voltage gradient exceeding a certain critical value.

A

Corona

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36
Q

___________ is a branch circuit that supplies a number of outlets for lighting and appliance.

A

General purpose branch circuit

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37
Q

The minimum number of branch circuits shall be determined from the __________________________

A

total computed load and the rating of the circuits used.

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38
Q

The insulated conductor of type TC (cable tray) cable shall be in sizes _____(mm2) through _______(mm2) copper.

A

0.75 mm2

500 mm2

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39
Q

A motor-generator arc welder has a 70% duty cycle, the supply conductors shall NOT be less than ___ of its rated primary nameplate current.

A

86%

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40
Q

A frequency meter is connected as a potential device, which is connected across the line because of the : ____________________

A

reading will be independent of the varying current.

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41
Q

Rigid non-metallic conduit approved for direct burial without concrete encasement shall have a minimum burial of _______(mm).

A

460 mm

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42
Q

All metal parts associated with the hot tub shall be bonded using copper bonding jumper, insulated, covered, or bare, NOT smaller than ___(mm2).

A

8 mm2

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43
Q

All lighting fixtures, submersible pumps and other submersible equipment used in fountains shall operate at ____V or less between conductors.

A

250 V

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44
Q

The ____________ when installed in earth shall be placed _____ (mm) above all cable in a trench.

A

ground counterpoise

75 mm

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45
Q

Type FCC cable shall NOT be used in any of the following EXCEPT

outdoors
Indoors
Wet locations
Hazardous locations

A

Indoors

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46
Q

The ampacity of the conductors and the rating or setting of over-current devices in a circuit of a __________ shall NOT be less than ___% of the computed current.

A

solar photovoltaic system

125%

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47
Q

For signaling circuits NOT exceeding ____V the current required shall NOT exceed _ A.

A

24 V,

1

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48
Q

The grounding electrode shall be

3

A

The nearest available effectively grounded structural metal member of the structure.
The nearest available effectively grounded metal water pipe
The nearest concrete encased electrode

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49
Q

Non-metallic boxes NOT over________cm3 shall be permitted only on non-metallic wiring method.

A

1,640 cm3

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50
Q

The equipment bonding jumper (the connection between the equipment grounding conductor and the grounding impedance) shall be an ________ conductor run.

A

unspliced

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51
Q

According to its make, conduits maybe classified as

A

Rigid metal
Rigid non-metal
Flexible metal

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52
Q

In no case shall the grounding conductor be smaller than _____(mm2) copper.

A

8 mm2

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53
Q

________ – Hazardous location in which flammable gases or vapors are present in the air in quantities sufficient to produce explosives or ignitable mixtures.

A

Class I

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54
Q

The system neutral conductor shall NOT be connected to ground, EXCEPT through the ___________

A

neutral grounding impedance.

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55
Q

In a damp or wet locations, cabinets and cutout boxes of the surface type shall be mounted with at least _________(mm) air space between the enclosure and the wall.

A

6.4 mm

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56
Q

. The minimum diameter of a solid air terminal under class I material requirements shall be _____ for copper and_____ for aluminum.

A
  1. 5 mm

12. 7 mm

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57
Q

. Circuits with a nominal voltage of 600 V or less in a rigid metal conduit or intermediate metal conduit and placed in a trench below a _____(mm) thick ______(mm) or equivalent shall maintain a minimum cover distance of ________.

A

50 mm . concrete

150 mm

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58
Q

Vertical clearances of all service drop conductors above roofs shall NOT be less than _______(mm)

A

2,500 mm.

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59
Q

The lightning conductor or ground terminal shall extend vertically NOT less than______(mm) into earth.

A

3,000 mm

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60
Q

The circuit supplying an ________ type dimmer shall NOT exceed _____V between conductors.

A

autotransformer

230 V

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61
Q

is a spark occurring between nearby metallic objects or from such objects to the lightning protection system or to ground.

A

Sideflash

62
Q

Covers for boxes shall be permanently marked. The marking shall be on the outside of the box using the block type letters at least _____(mm) in height.

A

12 mm

63
Q

When wiring a raceway at least ______(mm) of free conductors shall be left at each outlet.

A

150 mm

64
Q

Where a rigid metal conduit is used, there shall NOT be more than the equivalent of _______ between pull points.

A

4 quarter bends

65
Q

There shall be at least _____ on a heavy-duty smoke or vent stacks.

A

2 down conductors

66
Q

If the setting of the over-current device in a circuit ahead of the equipment is 60 A, the minimum equipment grounding conductor using copper shall be _______(mm2)

A

5.5 mm2.

67
Q

is an exposed wiring support system using a messenger wire to support insulated conductors.

A

Messenger supported wiring

68
Q

Air terminal shall be within ______(mm) of outermost projection of roof edge.

A

600 mm

69
Q

In replacing a busted fuse which of the following is important?

A

Ans. same size and type

70
Q

________ have 75-ohm impedance.

A

Coaxial wires

71
Q

Rigid metal conduit shall be shipped in standard lengths of ____(mm)

A

3,000 mm.

72
Q

is the term given to an insulated stranded wire.

A

Cord

73
Q

Exposed non-current carrying metal parts of fixed equipment likely to become energized shall be grounded under the following conditions. Which one is NOT included?

Where located in wet or damp locations
Where in electrical contact with wooden floor
Where in a classified hazardous locations
Where supplied With a metal raceway or other wiring methods

A

Where in electrical contact with wooden floor

74
Q

Electrical equipment except x-ray tube inside anesthetizing room shall be located at least
_____(mm) above the floor.

A

2,400 mm

75
Q

Where the distance requirement in making holes cannot be maintained, the _______ shall be protected from penetration by __________________
at least _______(mm) thick and of approved length and width to cover the area of the winding.

A

cable or raceway

screws or nails by a steel plate of bushings

1.6 mm

76
Q

The entire area of the aircraft hangar, including any adjacent communication areas not
suitably cut-off from the hangar shall be classified as hazardous up to a level of _____(mm) above the floor.

A

460 mm

77
Q

In which method of starting a motor is the starting current a minimum?

A

Ans. star-delta

78
Q

All switches and circuit breakers used as switches shall be so installed that the center of
the grip of the operating handle when in i ts highest position shall NOT be more than ______(mm) above the floor or working flatform.

A

2,000 mm

79
Q

For straight pulls, the length of the pull box shall NOT be less than ___ times the outside
diameter of the largest non-shielded conductor or cable.

A

32

80
Q

____________ shall NOT be permitted to be used.

A

Aluminum electrode

81
Q

Electrical non-metallic tubing shall be clearly and durably marked at least every _____(mm)

A

3,000mm.

82
Q

Which of the fol lowing sizes of fuse is NOT standard?

80 A, 45 A, 125 A, 75 A

A

75 A

83
Q

The PEC, Part _ does not cover wiring of equipment installed within ______.

A

1

airplanes

84
Q

is the smallest electrical trade size of intermediate metal conduit. (mm)

A

15 mm

85
Q

The use of electrical metallic tubing shall be permitted for ____________(2).

A

exposed works and concealed works

86
Q

The zone of protection of an overhead ground wire is conventionally taken as a ________.

A

triangular prism

87
Q

The minimum spacing between bare metal parts of opposi te polari ty where mounted on the
same surface shall be ____(mm) for voltages rated NOT over ____(V) nominal .

A

32 mm

250 V

88
Q

The maximum electrical trade size of flexible metallic tubing shall be ____(mm).

A

20 mm

89
Q

is a protective device for limiting surge voltages by discharging or by passing
surge current.

A

Arrester

90
Q

A convenience outlet circui t consisting of 8 outlets connected across a 220 V supply
considering 180 W per outlet, what is the maximum circuit current? (A)

A

Ans. 6.54 A

91
Q

Plug fuses and fuse holders shall NOT be installed or used in circuits exceeding ______V
between conductors.

A

250 V

92
Q

The standard length of rigid metal conduit is ______

A

10 feet.

93
Q

For warehouses, the feeder demand load for the general l ighting and smal l appl iance load
for the first 12,500 VA or less is 100%, whi le the remainder over 12,500 VA is charged at
_____%

A

50%.

94
Q

Liquid tight flexible non-metallic conduit shall NOT be used in lengths longer than ____(mm)

A

1,800mm.

95
Q

Line and ground connecting conductors to surge arresters shall NOT be smaller than ____(mm2) copper or _____(mm2) aluminum.

A

2 mm2

3.5 mm2

96
Q

Electrical metallic tubing shall be securely fastened in place at least every ________(mm)

A

3,000 mm.

97
Q

For the purpose of lightning protection, class I ordinary building is one that is at less than ____m in height.

A

23 m

98
Q

For dwelling units, the demand factor for the first 3,000 VA of load is _____%

A

100%.

99
Q

Ventilating pipes for motors, generators or other rotating electric machinery of for enclosures for electric equipment shall be of metal NOT less than _____(mm) in thickness.

A

0.50 mm

100
Q

. Direct burial cables or conductors with nominal voltage of 600 V or less and passes under streets, hi-ways, roads, alleys, driveways and parking lots shall have a minimum cover distance of _____(mm).

A

600 mm

101
Q

is a factory assembly of parallel conductors formed integrally with an insulating material web specifically designed for field installation in metal surface raceway.

A

Type FC

102
Q

Snap switches shall NOT be grouped or ganged in enclosures unless they can be so arranged that the voltage between adjacent switches does NOT exceed .

A

300 V

103
Q

Wiring located above heated ceilings shall be NOT less than ______(mm) above the heated ceiling and shall be considered as operating at an ambient of 50C.

A

50 mm

104
Q

are rectangular sheet metal enclosures equipped with removable covers providing access to conductors inside.

A

Wireways

105
Q

Each unit length of heating cable shall have a permanent legible marking of each non-heating lead located within ______(mm) of the terminal end.

A

75 mm

106
Q

Metal faceplates or receptacles shall be of ferrous metal NOT less than _____(mm) in thickness or of non-ferrous metal NOT less than __(mm) in thickness.

A

0.76 mm

1 mm

107
Q

Surface mounted incandescent fixtures shall be permitted to be installed in clothes closets provided there is a minimum clearance of _____(mm) between the fixture and the nearest point of the storage area.

A

300 mm

108
Q

Thermal insulation shall NOT be installed within _______(mm) of the recessed fixture enclosure.

A

38 mm

109
Q

Lighting track load shall NOT be installed where less than 1,500 mm above the finished floor EXCEPT where protected from physical damage.

A

1,500 mm

110
Q

Where circuit breakers are used to protect the primary side of a transformer over 600 V nominal, their continuous current rating shall NOT exceed _____% of the rated primary current.

A

300%

111
Q

The lowest standard size of disconnect is ___A (April 2016)

A

30 A.

112
Q

The primary winding of a step down transformer shall be protected on the primary side by an over-current device rated NOT more than ____% of the primary current.

A

125%

113
Q

For a two-wire FCC cable system with grounding, the ________ shall be the ___________.

A

grounding conductor

middle conductor

114
Q

Where passing through wood cross members in plastered partitions, conductors in concealed knob and tube wiring shall be protected by insulating tubes extending NOT less than ____(mm) beyond the wood member.

A

76 mm

115
Q

Branch circuit conductors supplying a single motor shall have an ampacity NOT less than ____% of the motor full load current rating.

A

125%

116
Q

In indoor wet locations, the entire wiring system including all boxes, fittings, control boards and panelboards shall be installed on walls with _____(mm) minimum clearance.

A

10 mm

117
Q

Type NM cable shall NOT be installed…

3

A

Where exposed to corrosive material
Where embedded in concrete
In a shallow chase in masonry, concrete or adobe

118
Q

Dry type transformers installed indoors and rated ____kVA or less shall have a separation of at least _____(mm) from combustible material.

A

112.5 kVA

300 mm

119
Q

is a factory assembly of two or more insulated conductors in an extruded core of moisture resistant, flame retardant non-metallic material covered with an overlapping spiral metal tape and wire shield and jacketed with an extruded moisture, flame, oil, corrosion, fungus and sunlight resistant non-metallic material.

A

Type SNM cable

120
Q

To cut rigid metal conduits, an electrician should use a _____ and _____.

A

hack saw

ream the ends

121
Q

Where the overload relay selected using the factor ____% is not sufficient to start the motor or to carry the load, the multiplying factor shall be increased but shall NOT exceed ___%.

A

125

140

122
Q

Where the protection of a motor-compressor load is not sufficient for the starting current of the motor, the rating or setting shall be increased but NOT more than ___% of its rated load current.

A

225

123
Q

is an insulator designed to electrically insulate the end of a type FCC cable.

A

Insulating end

124
Q

consists of 3 or more flat copper conductor placed edge to edge separated and enclosed within an insulating assembly.

A

Flat conductor cable

125
Q

Lamp holders installed in wet or damp locations shall be of the ________

A

weatherproof type.

126
Q

The single-phase conductors supplying the phase converter shall have an ampacity NOT less than _______ the full load current rating of the motor or load being served.

A

2.16 times

127
Q

is an assembly of 2 insulated conductors within a non-metallic jacket or an extruded thermoplastic covering.

A

Non-metallic extension

128
Q

Dry type transformers rated over _______V, shall be installed in vaults.

A

35,000 V

129
Q

In walls or ceilings of concrete, tile, or other non-combustible materials, boxes and fittings shall be installed that the front edge of the box or fitting will NOT set back of the finished surface more than _____(mm).

A

6.4 mm

130
Q

is a single or multi-conductor solid dielectric insulated cable rated 2001 volts or higher

A

Type MV cable

131
Q

In selecting the maximum setting of an instantaneous trip CB to be used to protect all AC motors from short circuit, a multiplying factor of ______% shall be used.

A

700%

132
Q

The paper spacer thickness of type IGS cable having a conductor size of 125 mm2 to 500 mm2 shall be _____(mm)

A

1.02 mm.

133
Q

________ is the minimum number of over-current device of a lighting and appliance panel board that shall be installed in a cabinet.

A

48 devices

134
Q

Intermediate metal conduit shall be firmly fastened within ______(mm) of each outlet box, junction box, cabinet or fitting.

A

900 mm

135
Q

Resistance type heating elements in electric space heating equipment shall be protected at NOT more than ___(A)

A

60 A.

136
Q

Heavy-duty lighting track is a lighting track identified for use exceeding ___(A).

A

20 A

137
Q

For three-phase motors supplied by any 3-phase system, the number of overload units required shall be _, one in each phase.

A

3

138
Q

As compared with solid wires, stranded wires of the same cross sectional area have the following advantage EXCEPT one. Which one is this?

It is larger in overall diameter
It is easier to skin off the insulation
It is better for high voltage
It has a higher current rating

A

It is easier to skin off the insulation

139
Q

Each length of the rigid metal conduit shall be clearly and durably identified in every _________(mm) as required.

A

3,000 mm

140
Q

For all single-phase motors, to protect them from short circuits and ground faults, a multiplying factor of ____% of its full load current rating shall be used the protective
device selected is a non-time delay fuse and_____% if the protective device is a time delay fuse.

A

300%

175%

141
Q

Flexible metal conduit shall be supported within _______(mm) on each side of every outlet box, junction box, cabinet or fitting.

A

300 mm

142
Q

. The maximum electrical trade size of electrical metallic tubing shall be .(mm)

A

100 mm

143
Q

For installations of 2 mm2 conductors in 600 V circuits. What is the minimum insulation resistance allowed by the PEC (ohms)

A

Ans. 500,000 ohms

144
Q

__________ transformers installed indoors and rated over _______kVAshall be furnished with a pressure relief vent.

A

Askarel insulated

25 kVA

145
Q

In straight pulls, the length of the pull box shall NOT be less than ______the trade diameter of the largest raceway.

A

8 times

146
Q

Busways shall be securely supported at intervals NOT exceeding _____(mm) unless otherwise designed and marked.

A

1,500 mm

147
Q

The smallest electrical trade size of a liquidtight flexible non-metallic conduit shall be ________(mm).

A

20 mm

148
Q

Boxes intended to enclose flush devices shall have an internal depth of NOT less than _____(mm).

A

24 mm

149
Q

A branch circuit supplying a fixed storage type water heater having a capacity of 450 liters or less shall have a rating NOT less than ____(mm) of the nameplate rating of the water heater.

A

125%

150
Q

is define as the shortest distance measured between a point on the top surface of any direct buried conductor, cable, conduit and the top surface of finish grade.

A

Cover

151
Q

.

A

.

PEC (19 decks)

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